Ciencias,UNAM

Stellar populations of early-type galaxies in different environments - II. Ages and metallicities

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dc.contributor.author Gorgas, J
dc.contributor.author Cardiel, N
dc.contributor.author Sánchez-Blazquez, P
dc.contributor.author González, JJ
dc.date.accessioned 2011-01-22T10:26:22Z
dc.date.available 2011-01-22T10:26:22Z
dc.date.issued 2006
dc.identifier.issn 0004-6361
dc.identifier.uri http://hdl.handle.net/11154/3188
dc.description.abstract Aims. This is the second paper of a series devoted to the study of the stellar content of early-type galaxies. The goal of the series is to set constraints on the evolutionary status of these objects Methods. We use a new set of models that include an improved stellar library (MILES) to derive simple stellar population (SSP)-equivalent parameters in a sample of 98 early-type galaxies. The sample contains galaxies in the field, poor groups, and galaxies in the Virgo and Coma clusters. Results. We find that low-density environment galaxies span a larger range in SSP age and metallicity than their counterparts in high density environments, with a tendency for lower sigma galaxies to be younger. Early-type galaxies in low-density environments appear on average similar to 1.5 Gyr younger and more metal rich than their counterparts in high density environments. The sample of low-density environment galaxies shows an age-metallicity relation in which younger galaxies are found to be more metal rich, but only when metallicity is measured with a Fe-sensitive index. Conversely, there is no age-metallicity relation when the metallicity is measured with a Mg sensitive index. The mass-metallicity relation is only appreciable for the low-density environment galaxies when the metallicity is measured with a Mg-sensitive index, and not when the metallicity is measured with other indicators. On the contrary, this relation exists for the high-density environment galaxies independent of the indicator used to measure the metallicity. Conclusions. This suggests a dependence of the mass-metallicity relation on the environment of the galaxies. Our data favour a scenario in which galaxies in low density environments have suffered a more extended star formation history than the galaxies in the Coma cluster, which appear to host more homogenous stellar populations. en_US
dc.language.iso en en_US
dc.title Stellar populations of early-type galaxies in different environments - II. Ages and metallicities en_US
dc.type Article en_US
dc.identifier.idprometeo 1327
dc.identifier.doi 10.1051/0004-6361:20064845
dc.source.novolpages 457(3):809
dc.subject.wos Astronomy & Astrophysics
dc.description.index WoS: SCI, SSCI o AHCI
dc.subject.keywords galaxies : abundances
dc.subject.keywords galaxies : elliptical and lenticular
dc.subject.keywords cD-Galaxy : stellar content
dc.subject.keywords Galaxy : formation
dc.relation.journal Astronomy & Astrophysics

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